Seashore or wild chamomile, matricaire à capitules brunâtres

Matricaria inodora Linnaeus var. phaeocephala Ruprecht, Fl. Samojed. Cisural., 42. 1845; M. ambigua (Ledebour) Krylov; M. maritima Linnaeus subsp. phaeocephala (Ruprecht) Rauschert; M. maritima var. phaeocephala (Ruprecht) Rauschert; Tripleurospermum hookeri Schultz-Bipontinus; T. phaeocephalum (Ruprecht) Pobedimova

Phyllaries broadly triangular, scarious margins blackish brown, 0.4–1 mm wide. Cypselae: resin gland lengths usually little more than twice widths. 2n = 18.

Flowering Jul–Oct. Low Arctic seashores and beaches (near high tide strand line), moist to moderately well-drained areas, gravel, sand, moss; 0–50 m; Greenland; Man., N.W.T., Nunavut, Ont., Que., Yukon; Alaska; arctic Eurasia.

Subspecies phaeocephalum occurs along the low Arctic shore (both continental and insular) from Alaska to Quebec; it does not penetrate north into the Canadian Arctic Archipelago; it does not reach Labrador; it is present in Greenland. If treated as a species, the name T. hookeri Schultz-Bipontinus has priority (N. N. Tzvelev 2002b).